new line (or lines) in a spectrum meant a new element."*6
He called it Gallium, this new element had very similar properties to
Mendeleev's predicted element 'eka-aluminium'; this therefore
supported his idea of the Periodic table hugely.
Table 1, comparing Mendeleev's prediction with the properties of
element 31, gallium. *7
Gallium has some very unusual properties, some which suggest that it
is a metal and some that imply it is a non-metal.
Its physical properties, a melting point of 29.78Â°C (which is almost
UK room temperature) making it a liquid metal along with Mercury and
Caesium. It also has an extremely high boiling point, 2403Â°C; together
with its low boiling point gallium has the 'widest liquid range' of
any element discovered so far. Gallium is also denser as a liquid than
as a solid, as is water.
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Gallium's chemical properties include, dissolving in acid and alkalis,
evolving hydrogen. Aluminium and